BQ24702_16 Datasheet, PDF (6/37 Pages) Texas Instruments – MULTICHEMISTRY BATTERY CHARGER CONTROLLER

bq24702
bq24703
SLUS553E – MAY 2003 – REVISED OCTOBER 2007
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ELECTRICAL CHARACTERISTICS (Continued)
–40°C ≤ T_J ≤ 125°C, 7 V_DC ≤ V_CC ≤ 28 V_DC, all voltages relative to V_SS (unless otherwise specified)
PARAMETER
TEST CONDITIONS
MIN
BATTERY CURRENT-SENSE AMPLIFIER
g_m
Transconductance gain
75
CMRR
Common-mode rejection ratio
See ⁽¹⁾
V_ICR
Common-mode input (SRP, SRN) voltage
range
VCC = SRN, SRP + 2 V
5
I_(SINK)
I_IB
V_(SET)
A_V
Sink current (COMP)
COMP = 1 V, (SRP–SRN) = 10 mV
Input bias current (SRP)⁽²⁾
V_(SRP) = 16 V, (SRP–SRN) = 100 mV,
SRSET = 2.5 V, VCC = 28
Input bias current accuracy (I_SRP – I_SRN)
(SRP - SRN) = 100 mV, SRSET= 2.5 V,
VCC = 28 V, 0 ≤ T_J ≤ 125°C
Battery current programming voltage (SRSET)
Battery current set gain
0.65 V ≤ SRSET ≤ 2.5 V,
8 V ≤ SRN ≤ 16 V ⁽³⁾
Total battery current-sense mid-scale accuracy
SRSET = 1.25 V, T_J = 25°C⁽⁴⁾
SRSET = 1.25 V⁽⁴⁾
Total battery current-sense full-scale accuracy
SRSET = 2.5 V, T_J = 25°C⁽⁴⁾
SRSET = 2.5 V⁽⁴⁾
0.5
70
–3
0
24
–5%
–6%
–3%
–4%
TYP MAX
120 175
90
30
1.5 2.5
85 110
0
3
2.5
25 26
5%
6%
3%
4%
UNIT
mA/V
dB
V
mA
μA
V
V/V
(1) Specified by design. Not production tested.
(2) I_(SRP) = I_(SRN) = (V_(SRSET) / 50 kΩ) + ((V_(SRP) - V_(SRN) / 3 kΩ)
example: If (V_(SRSET) = 2.5 V) , (V_(SRP) - V_(SRN) = 100 mV) Then I_(SRP) = I_(SRN) = 83 A
(3)
IBAT
+
SRSET
RSENSE
1
AV
(4) Total battery-current set is based on the measured value of (SRP–SRN) = Δm, and the calculated value of (SRP–SRN) = ΔC, using the
measured
gain,
Dc
A_V.
+
SRSET
AV
,
Total accuracy in %
(Dm * Dc)
+ _Dc
100, I_(SRP) * I_(SRN) + 0
6
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